Improvement in the manufacture of paper-stock



H A. T. sTunn'EvANT.

. Manu'ac'ture of Paper Stock.

No. 143,940. y Patenfedoct. 21,1873.

PATENT OFFrcEc ALFRED T. STURDEVANT, OF MOUNT PLEASANT, NEW` YORK.

IMPROVEMENT IN THE MANUFACTURE OF PAPERSTOCK.

Specification forming part of Letters Patent No. 143.940, dated October21, 1873; application iiled January 30, 1873. Y

To all whom it may concern:

Be it known that I, ALFRED T. STURDE- vANT, of Mount Pleasant, in thecounty of Ulster and State of New York, have invented an Improvement inthe Manufacture of Paper- Stock, of which the following is aspecification:

This process consists in reduciuwood shavings or cuttings to a fibrouscondition for paper-stock, or in the further reduction of bers partlyreduced by any other process, by rubbing them over a reticulated orother rough surface or bed by elasticrubbers without passing the iibrousparticles through such surface or bed. It may be used either alone or inconnection with a process for which Letters Patent were granted to meJuly 16, 1872. The machine I purpose to use in carrying out my inventionconsists of a cylinder lined with wire gauze,` or other materialpresenting a rough surface, and series of elastic rubbers arra-nged on adrum revolving within the cylinder.

Figure l in the accompanying drawing is a transverse section of thismachine. Fig. 2 is a longitudinal section of the same, and Fig. 3 is aplan of the machine with its hood or cover removed.

Similar letters of reference indicate corresponding parts in the severaliigures.

A is the cylinder of the machine. It is made in two parts hingedtogether, one being supported on legs a a and the other hinged to it.Both are lined with wiregauze, but any other material or substancepresenting a rough surface may bc substituted for it. The cover or upperhalf of the cylinder is furnished near one end with a. hopper, b, and inthe opposite end of the lower part of the cylinder there is a hole orescape-opening, c. B is the drum, on which the rubbers are arranged. Itis represented as having a series of rubbers, O O, on each of foursides. It may, however, be furnished with more or fewer series. Each setor series of rubbers is secured to the side of a lug, e, inclined to theaxis of the drum, so that they never rub together in a line axial to thecylinder. By this means the woodshavings or cuttings fed into the hopperas they are rubbed are fed up toward the escape-opening in the oppositeend of the cylinder. The rubbers O vO may be made of india-rubber orsteel, or brushes may be used, and in some cases brushes may be used inconnection with the rubbers. The wire-gauze or other substance used maybe made gradually finer toward the escape-openin g, so that theparticles to which the wood cuttings are reduced will graduallydecreasein size till delivered from the machine. The shaft of the drum-B consists of a pipe, which is perforated within the drum to providefor the admission of steam thereto when desirable. The wood shavings,cuttings, or fibers to be reduced are introduced into the cylinderthrough its hopper, and are reduced or disintegrated by attritionproduced by rubbing them on thc lining of the cylinder. The cuttings,shavings, or iibers may be worked either wet or in the natural moiststate of the wood, or dry. When wet or moist, steam is admitted to thedrum to dry the cuttings while being worked.

I claiml. The process of reduciu g wood cuttings, shavings, or fibers toa condition to be worked into paper-pulp by rubbing them over a roughsurface or bed by means of elastic rubbers` without passing them throughsuch surface or bed, substantially as herein described.

2. The combination of the cylinder A, having a rough lining or sinface,and the elastic rubbers O O, arranged as herein described, substantial]y for the purpose set forth.

ALFRED T. STURDEVANT.

Vituesses:

FEED. HArNEs, MICHAEL RYAN.

